Can I sue my son's father for his share of unpaid orthodontic bills?

Question Details:

My son's father (non-custodial parent) was paying for 1/2 of our son's braces. He called child support and they told him he didn't have to pay. But the court order I have states 50/50 on unpaid medical/dental bills. Can I sue for the remaining 1/2 payments?

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